Machine for cutting helicoidal gear-teeth.



No. 709,235 Patented Sept. I6, |902. L. F. A. MDNNERET.

MACHINE FDR CUTTING HELICDIDAL GEAR TEETH.

(Application med nec. 14, Y1899.

6 Sheets-Sheet -I.

(my modem ws Brems co.. PHOTO-umol, wnsumorou, n c.

Patenfedsepf. la, |902.'

L. F.*A. MUNNERET. MACHINE FOR CUTTING HELICUIDAL GEAR TEETH.

. 4 (Applicatio mea Dec'. 14, 1699.) (No Model.)

6 Sheets-Shet 2.

No. 709,235. Patented sept. la, |902.

- L. F. A. MUNNERET.

MACHINEVAFOB CUTTING HELIGOIDAL GEAR TEETH.

(Application iled Dec'. 14, 1899.)

6 Sheets--Sheet 3.

(No Model.)

' L. F. A. muNNEnET.

lli-AGHINEVFUR CUTTING HELICOIDAL GEAR TEETH.

v (Application `iled. Dec. 14, 1899.) (No Mnde l.)' 6 Shaets-Sheet 4.

Patented Sept.. I6, |902;

Fre sf N0. 709.235. Patented Sept. 16, |902.

L. F. A. MUNNEBET. MAGl-IINE FOB BUTTING HELICUIDAL GEAR TEETIH.

(Application and nec. 14,1899.) (Np Model.) Y .6 Sheets-Sheat 5.

' FIG- 6..

ws cu. mow-uma., wAsHmeToN. D4 c,

un model.)

Patented Sept-16,' |902. L. F. A. MUNNERET. MACHINE FOR CUTTING HELIGDIDAL GEAR TEETH..

(Application med Dec. 14, 1899.)

TH: News' Evans co.. PHo'rcMJTNo.. wAsmNuToN. D. c.

LON FRANCOIS ACHILLE MONNERET, OF PARIS, FRANCE.

MACHINE FORCUTTING HELICOIDAL GEAR-TEETH.

SPECIFICATION forming part of LettersPatent No. 709,235, dated September 16, 1902. Application tiled December 14,1899. Serial No. 740,255. (No model.)

To all whom, it nfl/ty concern:

Be it known that LLON FRANois ACHILLE lVIONNERET,engineer, a citizen ofthe Republic of France, residingat 169 Rue dAlsia, Paris, France, have invented certain new and useful Improvements in or Relating to Machines for Cutting Helicoidal Teeth on Vheels, of which the following is a specification.

Theory and practice alike have demonstrated the fact that, as regards gear-Wheels, helicoidal teeth produce a more easy and even motion than the straight-cut teeth. This is easily explained when it is remembered that, as regards straight-cnt teeth, each tooth acts by coming successively intothe plane of contact, Whereas in the case of teeth cut in helicoidal form the tooth comes in contact with this plane progressively as regards each of its portions. Moreover, in the case Where the axes are contained in the sa-me plane, such cases being of especial interest in the present case, the friction in helicoidal-toothed gear is less than in straight-cut-toothed gear, and especially with regard to conical gear-wheels. A conical pinion with helicoidal teeth is therefore always preferable to a conical pinion with straight-cut teeth and can be advantageously substituted for it in all cases. On the other hand, the continued rise in the cost of skilled manual labor makes the employment of automatic machines which can be attended to by more or less unskilled attendants a great desideratum, and especially from the point of economy machines which do not require the use of a great number of similar parts would be of advantage. For these reasons l have devised amachine which will automatically cut helicoidal conical teeth on bevel-gears, Which machine forms the subject-matter of the present invention. In the accompanying drawings I have represented such a machine by Way of example only.

Figure l is a longitudinal elevation of the machine. Fig. 2 is a plan of the machine represented in Fig. 1. Figs. 3 and 4: are elevations ot' opposite ends of the machine. Fig. 5 is a vertical longitudinal section along the principal axis ot' the machine. Fig. 6 is a cross-section on the same principal axis. Fig. 7 is a plan View partly in section. Fig. 8 is a diagrammatic view representing for demonstration the engagement of a bevel-pinion with a limit-wheel, of which the pitch-cone is a plane. Fig. 9 is a diagrammatic View representing the position of the tool with regard to the cone to be cut. Fig. 10 is a diagrammatic view of the carriers and ot' the screw, representing the disposition ofthe mechanism which transmits to the tool a positive movement for giving the desired involn'te shape to the teeth.

The mechanism may be divided into six principal divisions-namely, tool-reciproeating mechanism, work-support, mechanism for rotating the blank during the cutting to canse the tool to travel in a helical path on the periphery of the blank and to space the teeth, mechanism for giving an additional rotation to the blank at the end of each revolution and for feeding the tool so as to produce the tooth-curve, stop mechanism, and lubricatiom Tool-reciprocating mechcnsm--ln a frame- Work A is mounted in suitable bearings a shaft a., Fig. 5, provided with two pulleys ct d2, one of which is loose and the other fast and which receive a rotary movement from any system of transmission by means of a belt. On the shaft ct is keyed a stepped cone a3, which by means of a belt transmits its movement to another similarly-stepped cone b', loosely mounted on a shaft b of the fixed puppet B. This cone b is firmlyT connected with a toothed pinion b2, which meshes with a gear b3, Fig. 7, mounted on the same sleeve as a pinion b, which meshes with a gear h5, keyed on the shaft b in such a manner that by means of these intermediate gears the cone b will transmit to the shaft l) a rotary movement of a speed which can be varied as required. At its end the shaft b carries a circular plate c, provided with a diametrical groove, in which is adjustably arranged a crank-pin c. For this purpose the pin is provided With a screw-threaded eye,` with which a screw c2 engages. On this screw is mounted a beveled gear c3, gearing with a similar gear c4, fixed on an axle having a squared end, so that it can be turned with a key, so as to actuate the screw to move the pin c' nearer to or farther from the center of the plate c. On this pin c' is mounted a connecting-rod c5, connected with a plate c6, Figs. 5, 6, and 7, Which can be transversely `moved on 4a guide c7.

This plate c6 acts as a tool-carrier, and for this purpose it supports the tool by means of a number of suitably-combined carriers or parts. The first, p, Figs. 6 and 7, of these carriers can be adjusted on the plate c6 by the rotation of a screw 1. The second, p, has a movement perpendicular to th'e former by turning of a screw 2. On this second carrier 1o is rotatably arranged a third, p2, which can be turned by rotating a worm-screw 3, with which it engages, and finally a fourth cylindrical carrier p3, in which is fixed the tool y, is mounted in a casing which is pivoted at p4 to the carrier p2. The carrier p3 is provided with a set of teeth meshing with a worm 4, carried in the casing, by means of which it can be made to turn around its axis. vOn the shaft of Worm 4 is loosely mounted a drump, Figs. 4 and 6, around which acordpis wound, the ends of which are secured to adjustable holders on supports fixed on the guide c7. The drum p5 is frictionally mounted upon the shaft 4; but it carries within it bearings pressed against the said shaft by springs in a manner to constitute a friction-mounting, compelling the drum to turn by friction the shaft 4 in its rotation. Causing the shaft b of the fixed part B to rotate at a suitable speed, andin consequence the crank-disk c, Fig. 5, the face-plate c*i will partake of an alternate rectilineal movementon the guide c7 by means of tite stud c and the rod c5. The travel of this tool-carrier is easily regulated by suitably adjusting the pin c' in the groove of the plate c by actuating the screw c2 in the manner already described. The hinge-pin of the connecting-rod c5 of the plate c6 may also be adjusted in a` groove in the latter for the purpose of adjusting the position of the tool, and the screwing up of its nut insures its fixed position. The position of the tool can be adj usted in the following manner: By moving the tool-carrierspand p by turning the screws l and 2 the tool ft/ is brought exactly' into the center line z z, Fig. 7, which line is the line of intersection betweenavertical plane passing through the axis of the pivotfand a horizontal plane passing through the top of the cone of the blank about to be cut. By turning the circular carrier p2 by working screw 3 the necessary inclination is given to the tool t and by turning, by means of the screw 4, the sleeve p3, which carries the tool, the tool is made to turn around its axis,v so as finally to occupy the position.

which is most suitable for the purpose. At theV beginning of each reciprocating movement the drum p5 moves by spring-friction the pivot p4 of the tool in one direction or the other in such a Way that during the forward movetnent the tool, which may rotate around the axle p4, is pressed against the carriagep" and raised during the return stroke, so as not to rub against the blank to be cut. The cord 1o offers the great advantage .that it adapts itself easily to all the positions of the tool-carrying device c and of the tool itself,

while its tension devices serve to regulate its engagement on the drum p5.

Work-support.-Opposite to the fixed stock B there is secured to a support 02a movable stock C, provided with a shaft la', which carries at one ofits ends a plate k2, with circular grooves serving for the fixing of the blank .fr to be cut. A central bar can pass through the hollow shaft la', so as to help in fixing of the work, as clearly represented in Fig. 5. The support C2 of the movable head carries a screw'o, engaging in a nut 0 of the head C and squared at its end, so as to be turned, by means of a hand-crank 02, for the purpose of conveniently adjusting the movable head C. Besides, this movable head C, with all its mechanism and its support C2, can turn around a central shaftfand be fixed in any required position by means of' T-holts or the like, the heads of which engage with a correspondingly-shaped groove provided in the table C. The latter is provided with a toothed sector n. with which engages a worm-screw n', Fig. 5, the shaft of which is connected by conical gears n2, Figs. l and 7, with a rod n3, squared at one end for the purpose of being turned by a hand crank or key. The sector n is provided with a tooth for every degree, equal to three hundred and sixty teeth for the Whole circumference, so that by making a complete turn of the shaft n3 the movable head is displaced to the extent of one degree. Moreover, on the shaft n.3 is provided a circular indicator n4, by means of which even fractions of a degree can be very exactly set. Further, the table C/ has a scale divided into degrees and fractions, in combination with which an index-pointer on the movable head works, as represented in Fig. 7. The blank a; about to be cut being fixed by the shaft la on the movable head or on the plate k2, mounted on this shaft, the blank is placed in the required position, so that the vertex of its cone lies in the axis of the shaftf. This head C moves in dovetail grooves in the part C2 and can be fixed in the required position by tightening the bolts C3 G3, Fig. 2. After this adjustment it is necessary to bring the blank a0 into such a position that one of the generatrices of the cone corresponding to the bottom of the teeth should be in the straight line described by the tool y, which, as described, moves in a plane passing through the geometric axis ot' the spindlef. In order to obtain this adjustment, the blank a: is turned around the shaftf by turning the shaft n3, by means of a key placed on its squared end, in consequence of which the gear-wheels yn2 will also turn and one of them will involve in its movement the worm n', thus moving the toothed sector involving the movable support C2, as well as the head C, wit-h the blank x, which is thus easily brought into the required'position. By screwing down the bolts 'm' m2 the support C? is firmly secured in place. As the angle at the vertex of the cone of the bottom of the teeth of the blank to be lOO IIO

.cut is known, this circular adjustment is easily obtained by bringing the zero-index of the support C2 opposite tothe number which denotes this angle on the degree-scale division of the fixed table C. VFrom what has been described above it willeasily be understood that a turn of the handle of the shaft n3 will produce a displacement of the axis of the movable head by one degree, and as the circular index n1 is divided into minutes and fractions of minutes the angular adjustment can be carried out with all the precision desired.

Mechanism for rotating the blank during the cutting to cause the tool to travel n a heh'- cal path on the periphery of the blank and to space the teeth-The pinion b2 of the cone h' gears with a wheel 15, Fig. 5, rigidly connected `to the bevel-gear t", loosely mounted with another similar gear Zon ashaft 113. These two gears, which gear with a third intermediate bevel-gear 114, supported by the same frame as shaft 113, have their hubs provided with clutches, so that either can be coupled with a clutch-sleeve t5, keyed on the shaft 113, b ut capable of being longitudinally displaced on said shaft. By means of a set of gear-wheels i6, provided, as in thread-cutting machines, with a suitable support, the shaft is can transmit` themovement to another shaft 117, provided with a gear is, `gearing with a wheel t9, with a double set of bevel-teeth, which turns around the shaft f, having suitable intermediate sleeves, as clearly shown in Fig. 5. The wheel i9 gears with another wheel @'10, Figs. 6 and 7, mounted on a sleeve which surrounds a shaft e9 with a similar wheel 1211, whichby transmission-gearing tu, Figs. 4, 6, and 7, transmits the movement to a pinion i12, which gears with a gear 13, Fig. 7, with a double set of teeth, the cylindricalset of teeth gearing with a wheel h'. The gear 13 `is mounted on a sleeve surroundinga screwthreaded shaft g. The gear h is'splitfor part of its length and can be clamped to its shaft h2 by means of abolt h3. On the shaft h2 is keyed a screw h, arranged between the arms or ends of a support h4. `The wormscrew h gears with a wheel 7c, Figs. 4 and 5, keyed in a longitudinal groove of the hollow shaft h' of the movable head C in such a marn- Aner as to permit this shaft to be longitudinally displaced by sliding in the hub of the wheel h.

It appears 4f rom what precedes that the gear h2 may transmit the rotary movement to the blank tobe cut and that this blank will turn in one direction or the other according as the clutch-shaft 715 is connected with one or the other of gears 'i' anda?. This blank has thus a continuous turning movement round its axis and the tool has an alternate rectilinear movement following a'generatrix of the cone of this gear, 'as stated above. `The connection of the two movements is obtained by means of gear-Wheels t6, which are so cornbined that the number of turns of the gear b2 is proportional to the number of turns of the blank. In other words, if the blank isto have n teeth the tool will make a complete reciprocating movement to and for each time that the blank turns of a revolution. Inasmuch as these two movements are mathematically unalterable and continue without stop, the result is that the division is absolutely correct, the tool making successively a full stroke on each of the teeth.` It will be also understood, on the other hand, that the tool `describing in its course a generatrixterminating at the apex of the cone while the blank is turning aroundin a continuons manner will describe on the blank a helicoidal curve the inclination of which only depends on the number of teeth and the stroke of the tool. Hence the operator will not have to trouble about the helicoidal movement, which will be produced by itself automatically by mounting the gearing M6 appropriate for the number of teeth to be cut and by regulating the stroke of the tool, the latter depending on the length of the teeth. When the operator is cutting the second blank, which is intended to gear with the rst-cut gear, he will in no wise alter the course of the tool, since the length of-the tooth remains the same. He will simply mount the set of gearing 6 016 according to the number of teeth of this second gear, and he Will change the direction ot' the helix by a simple movement of the clutch 5 t" i2 is r4, which produces the necessary alteration of direction. Under these conditions the two gears cannot fail to gear with eac-h other. One will have its helix directed to the left, while the other, as is necessary, has it directed to the right. Moreover, the different points of the two helices of two meshing gears will be in contact with each other at every moment or point of movement. In reality the movement of the tool instead of being uniform is a uniformly-varied movementof the IOO IIO

kind of those whose law is graphically represented by a sinuous curve, because the tool is actuated by a connecting-rod and crank. This movement is preferably adopted instead of a uniform rectilineal alternate movement, so as to avoid shocks and backlash which are produced in the latter movement when change in the direction of travel takes place, While the movement by connecting-rod and crank being uniformly varied avoids such shocks and insures a practically exact division, while at the same time the progressive Variation of speed secures a better engagement of the tool with lthe material. It is only necessary to be careful to arrange in setting the complementary pinions to be cut according to the same marks with regard to the travel `of` the tool, so that any slight difference iu the sinuous curve will occur in the same manner in the two gears, and consequently there Will'be no inconvenience. Thus, according to Fig. 9,

represents its path of travel and Z the length of the teeth it will be necessary to place the two complementary gears to be cut at the same distances d and b from the end of the travel of the tool. Finally, the helicoidal movement is produced automatically and requires no calculation. It is sufficient to employ the same movement of the tool for the two complementary gears and to set both identically relatively to this movement.

Mechanism for giving am additionaZ rotation Zo the bZcmk ai the end of each recoZiitio/ri dnd forfceding the tooZ so as to produce the Zooth-ciircc.-The guide c7 is not fixed, but is provided with a cylindrical hub, which is revolubly mounted in a support cs, Fig. 5, and provided with peripheral teeth gearing with a toothed wheel d. This wheel d gears with another wheel d', the latter in its turn gearing with another wheel d2, keyed to one end of a shaft d3, while the other end of this shaft is provided with a toothed pinion d4, which gears with a rack-bar d5, Figs. 1, 5, and 6, on a carrier d6, guided in a suitable groove. This carrier d6 serves as a guide for another carrier d7, Figs. 6, 10, provided with a nut d8, in which engages a screw c, mounted by means of its 'two ends in a support c, connected with the lower extremity of the centralshaftf of this part of the machine. The screwc is provided at one of its ends with a gear e2, Fig. 6, meshing with a similar gear e3, mounted on the same shaft as a conical gear e4, the latter gearing with a bevel-wheel e5, mounted with a similar wheel e6 on asleeve c7, which turns with a slight friction on the shaftf. The bevel-wheel cgears with agear e8, the shaft of which, e, is provided with a toothed wheel el", gearing with a similar toothed wheel e, mounted on another' shaft cl2, Figs. 4 and 7, which by means of intermediate gearing e13 communicates its movement to a shaft 614, provided at one of its eX- tremities with a gear e15. This latter gears with a similar gear el, mounted on the shaft g, provided with a screw-thread and squared at each end in order to receive a hand-crank or key for the purpose of turning it by hand. This screw g engages with a nut h5, carried by the support hAL of the endless screw h, which for this purpose can slide on its shaft h2 by means of a key. With the worm-wheel which transmits the movement of the endless screw h to the shaft k', carrying the blank to be cut, as described above, is secured a toothed wheel Z, gearing with another similar wheel Z,mount ed on a shaft with the plate Z2, Figs. 2 and 4, provided with a diametrical groove inwhich can be adjusted by means of a screw a crankpin`Z3. On this pin is mounted aconnectingrod Z4, which by suitable means can transmit the movement to a pawl Z5, which can be reversed from one side to the other, so as to be coupled in any direction required with a ratchet-wheel Z6, mounted on the shaft el, carrying the gear @15, which engages the screw g, as stated above. It' then the machine is working, the worm-wheel Zr., turning at a constant speed, as stated, will actuate once in every revolution by means of the toothed wheels Z and Z the crank-disk Z2, the latter actuating the connecting-rod Z4 and the pawl Z5. Inasmuch as the wheels Z and Z are equal, the pawl Z5 will move the ratchet-wheel Z6 through a fraction of its revolution for every turn of of the wheel 7c and of the blank tr. The ratchet-wheel Zi involves in its rotary movement the gears 615 and ew and the screw g. The nut h5, and consequently the support h4, receives a longitudinal movement, during which the worm-screw Zi acts like a rack-bar on the wheel Zt, thereby turning the latter, as well as the blank m. On the other hand, the ratchet-wheel Z6 involvesin its movement the shaft 614, Fig. 7, gears cl3, shaft cl2, gears en and cw, shaft e9, Fig.- 6, gear e8, wheel c, sleeve c7, wheel e5, the gears e4 c3 e2, and, flnally,thescrewc. Thelattercommunicates a translatory movement to the carriers d7 dG and rack d5, the latter turning the gears d4 d2 d' d and the slide c7, which is actuated by its toothed part ci. The plates c6, and consequently the tool y, participate in the rotary movement of the guide c7, the result of which is that the pointof the said tool is moved relatively to the blank x, which turns like the tooth of a wheel engaging with it, and this relative movement as regards the said blank is an involute of the circle according to which the teeth of the blank rc are cut.

The mechanism just described is naturally based on the properties of the curve named the involute of a circle. It is known that two wheels of the same pitch cut according to an involute will always gear with each other whatever be the number of their teeth. The limit-wheel of bevel-gears is a crowngear the angle at the vertex of which is one hundred and eighty degrees, and all wheels which will gear with the same crown-gear will gear with each other. It should be remembered that the pitch cone of this limit-wheel being a plane the shape of the teeth will be the same as that of the teeth of a rack-bar-i. e., they will be formed by straight lines, as represented in Fig. 8. It is therefore suicient to gear the blanks to be cut with the limitwheel by giving them the movement which they would have if they were to gear together in order that this limit-wheel should cut on the blank being operated on a tooth in the form of an involute. Evidently the same result would be obtained if instead of an actual limit-wheel a simple tool were employed for cutting the teeth the straight flanks of which are easily traced and which could be so worked as to generate the surface of the limit-wheel itself. Approximately, so as to avoid any adjustment being carried out by the attendant for a, the half-angle at the apex of the cone from the bottom of the teeth is taken. This angle may vary from zero to ninety degrees. The speed of the tool y is always less than that of the blank to be cut. Con- IIO sequently it is preferable that this movement should be transmitted through this gear to the tool. This rotary movement takes place slowly, as described, and only at the completion of each revolution of the gear being cut when the tool has passed over each of its teeth. It would be easy to demonstrate that the relation between the angular rapidity of the tool and the blank to be cut must. be equal tog; a. This mathematical relation is obtained by the combined movement of the shafts d and CZ7. (Diagram matically illustrated in Fig. l0.) It should beobserved that nut d8 describes a path parallel to the nut h5. The two perpendicular carriers dand d7 are moved along the sides of a rectangular triangle the hypotenuse of which is the straight line described by the nut d8; but as the same operation of adjusting the position of the blank to be cut by means of the rotation of the support C2 on the axis f, this support forms an angle a with the transversal carrier de, it follows that this carrier d6, provided with the rack d5, passes through the length of travel of the nut h5 multiplied by sin a. It is this amount which is transmitted to the wheel o9 by the intermediate action of the wheels d4 and d2, respectively proportional to the wheels 7a and c9 and also by the intermediate wheels d and cl. There is thus established between the rotary movements of the tool y and the blank about to be cut the required proportion of the angular speeds equal to sin Z a. The result is that the tool 'y will gear as the tooth of a wheel with the blank x and will describe on the latter an involute of a circle according to which the teeth are marked out no matter how great the angle a at the top of the primary cone may be. Thepitch of the screws g and e is such that their rotation is effected in a suitable direction. The handle placed on 011e of the ends of the screw-shaft yg allows this rolling movement to be brought about by hand.

Stop mccham'sm.-The gear-wheel of of the guide c7 is itself in gear with a rack r, provided with a groove in which at a suitable distance apart two stops s s, Figs. l, 2, and 3, provided with inclined planes, are fixed adapted to strike against a roller t', Fig. 1, provided at the end of a sliding rod t, connected to a three-armed lever t2. One of these arms is provided with a finger t3, adapted to engage with one of two recesses provided on a sector u, the opposite arm of said lever being constantly pressed upward by a spring-piston t, which forces the finger t3 to engage in either of the two recesses of the sector u which may come under it. This sector u is rigidly united with a lever u, which is connected to a rod u2, provided at one of its ends with a belt-shifting fork n3. This automatic uncoupling is regulated by the position and the distance between the inclined plane stops s s ou the rack-bar r. The latter receives from the wheel c an ascending or descending movement, according to whether a right or left hand gear is being cut. At a certain moment one of the stops s meets the roller t and movesfit and with it the rod t. The latter causes the levert2 to oscillate, whereupon the finger t3 leaves the recess in the sector' u in which it was engaged, and the lever 'Lt' under the action of some suitable spring is energetically drawn to the right, Figs. l and 5, in such a manner that the shaft u2 and the fork Lts are moved in the same direction, owing to which the belt is shifted from the fast to the loose pulley et', thereby stopping the machine automatically as soon as the tool y has finished its work. At this moment the finger t3 under the action of the small spring-piston yu becomes engaged in the other recess of the sector u and causes the lever tt to oscillate until the finger engages in the other recess, a position which corresponds with the position of the belt on the fixed pulley a2.

Lubrication-A small centrifugal pum p F, actuated by the principal operating-shaft a, draws up oil from a reservoir F' to force it out on the tool through a suitable conduit, the superfluous oil being collected by glitters arranged for that purpose on the framework, which deliver it back to the reservoir F', from which it is drawn up again by the pump for further use in connection with the tool y.

Operation of the machina-The operation of the present machine is described above quite fully. However, it is to be seen that the support h4, which carries the shaft of the endless screw h, operating by means of the wheel It, the shaft lt of the blank a: can turn a certain distance around the screw g.A The wheel la is thus thrown out of gear in such a 'way that it can be turned very quickly by hand in order to effect the centration of the pinion Qc. This movement of the screw h also allows the latter to be brought toward or from the wheel k more or less in order to take up any slack. Of course it is evident that only one side of the tooth is cut at a time and that the second side is obtained in the .same manner after the blank has been moved to an eX- tent corresponding to the width of the space between the teeth. For this purpose the clamp h3 has to be unscrewed so that the wheel 7c and also the shaft lo', with the blank x, may be turned by hand through an angle corresponding to the thickness of the teeth by means of the shaft h2 and endless screw h.

Having now fully described my invention, what I claim as new herein, and desire to seby Letters Patent, is-

In a machine for generating gear-teeth, the combination of a pivotally-inounted guide, a tool-slide reciprocable thereon carrying a cutting-tool, and means to reciprocate said slide on said guide, of an angularly-adjustable work-table, carrying a rotatable work-support, means to rotate said support including a worin-wheel mounted thereon, a train of gearing connecting said worin-wheel with the means for reciprocating the tool-slide, said IOC IIC

train of gearing passing through the pvot of the angularly-adjustable Work-table, so that generate the proper booth-curve. lo its operation is not; affected by any adjnsf.- Signed ab Paris, France, this 29th day of ment of the work-table, means operated by November, 1899.

the aforesaid Worm-Wheel once in each revo- LON FRANQOIS ACHILLE MONNERET.

will be fed into lche blank in such a Way as to lution thereof to turn the guide of the tool- Witnesses: slide about its axis and to give an additional PAUL BACARD, rotation to the blank-support, so that the tool l EDWARD P. MACLEAN. 

